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Diphenhydramine is a common antihistamine that many people use for allergy relief. Despite its effectiveness, it has several side effects. Common side effects include drowsiness, dizziness, constipation, blurred vision, and dry mouth/nose/throat. These may seem mild, but they can become problematic.
If taken in higher doses or for prolonged periods, diphenhydramine can cause more severe reactions, including confusion, difficulty urinating, and increased heart rate. Older adults are particularly susceptible to these severe reactions.

This is important for patients with an existing medical condition, as these side effects can worsen their symptoms.

An enlarged prostate, or benign prostatic hyperplasia (BPH), is a common condition in older men. It involves the enlargement of the prostate gland, which can lead to urinary symptoms. These symptoms include difficulty starting urination, weak urine flow, frequent urination, and an inability to empty the bladder completely.
When someone with an enlarged prostate uses diphenhydramine, they risk exacerbating these symptoms. Diphenhydramine can cause urinary retention, making it harder for the individual to urinate. This can lead to bladder infections, bladder stones, and even kidney damage if left untreated.
An older adult with BPH should exercise caution and consult a healthcare provider before using medications like diphenhydramine.

Glaucoma is an eye condition that damages the optic nerve, often due to high pressure in the eye. Medications to control glaucoma aim to reduce intraocular pressure (IOP).
Diphenhydramine can increase intraocular pressure, counteracting the effects of glaucoma medications. This interaction can lead to worsening of the glaucoma, potentially risking further vision loss.
Patients with glaucoma need to be particularly careful with medications. They should always check with their healthcare provider to avoid drug interactions that could compromise their eye health.

When advising patients about medications, nurses need to consider the person's entire medical history. In the case of the 74-year-old male client taking diphenhydramine for allergies, the nurse should advise against its use due to his history of BPH and glaucoma.
The nurse should recommend that the client speak with their healthcare provider to discuss safer alternatives. Alternatives such as second-generation antihistamines (e.g., loratadine or cetirizine) could be less likely to cause urinary retention or increase intraocular pressure.
Overall, open communication with healthcare providers is crucial. Nurses play a pivotal role in guiding patients towards safe medication choices and helping them manage their conditions effectively.